3.2 LBBAP characteristics and pacing parameters
The electrophysiological characteristics and pacing parameters of LBBAP are shown in Supplementary Table 1. The LBB capture threshold at implant was 0.9±1.1 mV, sensed R wave amplitude was 10.6±5.0 mv, and pacing impedance was 675.1±100.6 Ω. After pacemaker implantation, QRS duration was significantly decreased (128.6±30.2 ms to 120.5±20.1 ms, p=0.04) in the total LBBAP population.